Let-off for looms.



A. E. GHERNACK.

LET-OPF FOR LOOMS.

APPLICATION FILED 11011.14, 1912.

Patented July 28, 1914 l z SHEETS-sum1 1.

THE NORRA'S PETERS (Y). IHU'VUALTHU4 H/ASHNL.' FUN. l).

A. E. CHERNACK.

LET-OFF POR LOOMS.

APPLIoATmN FILED Nov.14,1912.

1,105,587. Patented July 28, 1914A 2 SHEETSFSHBBT 2.

M@ www 'UNITED STATES PATENT OFFICE.

ABEL CHRNACK, OE` PROVIDENCE, RHODE ISLAND.

LET-OFF FR LOOMS.

To all whom it may concern Be it known that I, Anni. E. CHERNACK, a subject of the Czar of Russia, residing in the city of Providence, in the county of Irovidence, State of Rhode Island, have invented a certain new and Improved Let-Oli' for Looms, of which the following is a specification.

My invention relates to the construction of frictional letotlls for the warp beams of looms, and the main object of my invention is to construct a simple and etlicicnt let-oil' which will provide automatically' a substantially uniform frictional effect upon the wai-ps, as they are let oil?.

In the accompanying drawings, Figure 1 is a side elevation with a detail :in section, of sufficient of the warp beam end of a loom to illustrate my invention; Fig. 2 is a sectional view at right angles to Fig. 1; Fig. 3 is a side View, drawn to a larger scale, of the brake lever and its guide bars; Fig. 4t is a corresponding plan View of the guide bars; Fig. 5 is a detached side View of the brake lever; and Fig. 6 is a view ot the end of the friction brake strap.

In Figs. 1 and 2, a portion of the side frame of the loom is indicated at 10 and is provided with a bearing 11, for a sleeve 12, within which is the spindle 13 of the warp beam 111. This sleeve 12 is provided with a pin 15, which when the sleeve is slipped onto spindle 13 before the beam is put into the loom, will enter a suitable hole in the end flange 1G of the warp beam. By this means when the beam and the adjusted sleeves are slipped into the bearings 11 in the opposite side frames, the sleeves and beam will revolve together.

In connection with the beam I provide at one or both ends thereof a friction brake wheel which is so connected to the beam as to revolve therewith either through the interposition of a suitable clutch or gear wheels or other convenient means. In the drawings I have shown a grooved friction brake wheel 17 mounted to turn in bearings in a bracket 18 secured to the frame of the loom, and adapted to be connected to the sleeve 12 through a suitable horizontally sliding clutch 19 (Fig. 2). Vith this brake wheel is combined a friction device in the form of a strap 20, bearin upon about onehalf (the upper half) of t is grooved brake Wheel, and this strap 20 is secured at one end Specification. of Letters Patent.

Application led November 14, 1912.

Patented July 28, 1914.

serial No. 731,330.

(Fig. 1) to a fixed projection 21. on the frame, und carries at its other end a cross pin Q2 (Fig. (l), by which it is connected to the brake lever 23 at B (Figs. 1, and 5). This brake lever is prevented from longitudinal as well as lateral movement by being guided horizontally and vertically by and between two fixed and spaced bars A held to the side of the frame by suitable bolts and nuts 25, Each bar has a horizontal slot 27 (Figs. 1 and 3) for the reception and guidance of a transverse pin QG against the underside of which bears the right hand end of the brake lever Q3. This pin constitutes a horizontally movable pivot for the brake lever 28, being moved horizontally outward as the warp benin diminishes in diameter, by the following or equivalent Inc-ans: Bearing against the periphery of the Warp beam is a wooden or other roller 28 (Fics. 1 and 2) carried by arms 2t) on a cross shaft 30 mounted in suitable bearngs in the side frames. To the outer end of this shaft. is adjustably secured by a set screw 31 an arm 3Q, whose lower end is forked to embrace the guide bars Q4. These forked ends are slotted to receive and carry the pivot pin 2G. To the shaft l() is also adjustably secured by a set screw 311 an arm 33 to the free end of which is connected a spiral pull spring of which the other end is secured to the frame. The action of this spring is to press the roller 28 constantly against the warp roll and correspondingly to move the pivot 26 toward the right hand end of the brake lever 23 as the warp roll diminishes in diameter. Upon the upper side of the opposite end of this brake lever Q3 at A. `bears a power means, preferably in the form of a spring 3G through a pin 37. This spring is contained within a box 3S, carried by a horizontal plate 39, which is secured by headed bolts et() to the upper side of the bracket 18 (Fig. 1). These bolts 40 pass through slots in the plate 3S) to permit of an adjustment of the bearing pin 37 to a limited extent in the direction of the length of the lever 23. A set screw 4t2 is provided to adjust the pressure of the spring 3G, according to the pressure required for the frictional braking effect of the strap 20 upon the brake wheel 17. This brake lever is thus of the second order of levers. The cross pin 22 connecting the brake strap to the lever 23 is guided in deep notches 44 in the upquently the pressure of the friction ,strap will proportionately diminish. By reason of the adjustments provided at the point of pressure of the spring 36 and at the point of securing of the arm 32 to the shaft 30, the pressure of the brake strap can be made to .vary exactly in direct proportion to the di- .-"ameter of the beam.

In other words, by these means the relation between the pressure when the beam is full and the pressure when the beam is nearly empty can be established to give uniform drag upon the warps at all times. Then when this regulation has been established, it is easy to provide greater pressure or less pressure throughout, by adjusting the set screw 42 acting on the spring 36.

By reason of the described construction the action of the mechanism is very sensitive and accurate as well as simple and easily adjusted.

Iclaim as my inventionl. A letoff motion for warp beams, comprising a friction wheel to rotate with the beam, a friction device therefor, a brake lever acting upon the friction device, a power means to act upon the brake lever, means to prevent longitudinal movement of the lever, and means for automatically varying the pivot point of the lever in proportion as the diameter of the beam diminishes, for the purpose set forth.

2. A let-ofrp motion for warp beams, comprising a friction wheel to rotate with the beam, a friction strap therefor, a brake lever acting upon the friction strap, a spring to beam, a friction strap therefor, a brake lever of the second order acting upon the friction strap, a spring to act upon one end of the lever, a movable pivot for the other end of the lever with a connection to the brake strap between, means to prevent longitudinal movement of the lever, and means for automatically moving the pivot outwardly as the diameter of the bea-m diminishes.

4. A let-off motion for warp beams, comprising a friction wheel to rotate with the beam, a friction strap therefor, a bralrelever acting upon the friction strap, a power means to act upon the brake lever, means to prevent longitudinal movement of the lever, a spring-pressed roller to bear against the warp beam and a movable pivot for the lever, connected with said roller to move such pivot as the diameter of the beam diminishes, for the purpose set forth.

5. A let-off motion for warp beams, comprising a friction wheel to rotate with the beam, a friction strap therefor, a brake lever acting upon the friction strap, a power means to act upon the lever, slotted bars between which the lever is held and guided, means to prevent longitudinal movement of the lever, a pivot pin for said leverin the slots of the bars, and means for automatically moving the pivot in the slotted plates, as the diameter of the beam diminishes.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

ABEL E. CHERNACK.

Witnesses:

ARTHUR T. S. PHETTEPLAGE, CHARLES M. SALISBURY.

Copier of this patent may 'be obtained for ve cents each, by addressing the Commissioner of Patents,

. Washington, D. C. 

